Four by Veronica Roth

'Four' is a collection of stories told in Tobias Eaton's point of view. Included is 'The Transfer', a pre-Divergent novella that details his aptitude test, Choosing Day experience, and how he got the nickname Four; 'The Initiate', another pre-Divergent novella, gives a glimpse into his initiation into Dauntless and his thoughts on what it means to be a divergent; a secret surrounding Four's past could have a great impact on his future in 'The Son', the third novella in the series; and finally we are brought to the present timeline of 'Divergent' with 'The Traitor' as Four discovers a sinister plan, and receives a transfer initiate - Tris Prior.